Introduction

This document features an interactive map of the Netherlands depicting all registered antennas with their respective height and purpose, as well as the municipality it is registered in.

Data

The data is available from Imergis (in Dutch), which is a site listing publicly available geographic data including administrative borders, infrastructure, and point objects such as important buildings, and of course the Antenneregister. The dataset contains the name of the municipality, purpose, coordinates and height in meters.

# Download file if it's missing
if (!file.exists('./gisdata/2015-09-Antenneregister-RD.shp')) {
    dataurl <- 'http://www.imergis.nl/shp/2015-09-Antenneregister-RD-shp.zip'
    localzip <- '2015-09-Antenneregister-RD-shp.zip'
    download.file(dataurl, localzip)
    unzip(localzip, exdir = './gisdata')
}
antennas <- readOGR(
    dsn = './gisdata', # For shapefiles point at directory above
    layer = '2015-09-Antenneregister-RD', # Shapefile name
    verbose = FALSE # Hide output
    )

# Convert coordinates from Dutch Rijksdriehoek to WGS84 (EPSG:4326)
antennas84 <- antennas %>% spTransform(CRS('+init=EPSG:4326'))

# Labels (%<>% is an advanced pipe operator from the magrittr package)
antennas84@data %<>%
    mutate(LABEL = paste0('Purpose: ', htmlEscape(TOEPASSING),
                          '<br/>Municipality: ', htmlEscape(GEMEENTE),
                          '<br/>Height: ', htmlEscape(ANT_HOOGTE), ' m'))

Plotting

To plot the 38744 antennas on the map we use the leaflet library, clustering them when zoomed out.

antennas84 %>%
    leaflet() %>%
    addTiles()%>%
    addMarkers(popup = antennas84$LABEL,
               clusterOptions = markerClusterOptions())

Libraries

This document was built using the following libraries:

library(magrittr) # v1.5
library(dplyr) # v0.5.0

library(htmltools) # v0.3.5
library(leaflet) # v1.0.1
library(rgdal) # v1.1-10